Rotary Seal Design Guide - Seals Unlimited

FlexiLipCatalog EPS 5350/USAEngineeringFlexiLip Installation Tool1.50"(38 mm)Radius (Blended)0.020” Max. (0.5 mm)80° to 85°16 µin (0.4 µm)Max. Shaft Ø +.002”(0.05 mm)Shaft Ø – .30”(7.6 mm)R 0.020” Max.(0.5 mm)Figure 9-2. Installation Tool DimensionsHardware NotesEach FlexiLip profile is given a standardpressure rating in Table 9-4 to aid the user in theselection of the most appropriate profile for anapplication. These pressure ratings are based onthe assumptions that there is a large extrusion gapas shown in the first illustration and that thetemperature at the gap is less than 300 °F (149 °C).Tightening the extrusion gap to around 0.015" (0.38 mm)on non-excluder lip profiles can double or triple thepressure rating for the seal. The extrusion gap forprofiles with excluder lips must be at least 0.062"(1.6 mm) to allow the excluder lip to extend beyond theoutside of the seal envelope if necessary.Reducing the extrusion gap does not improve thepressure rating of a seal with an excluder lip.0.062” Min.(1.6 mm)Extrusion Gap0.015 Max.(0.38 mm)Extrusion GapDust/DirtExcluderLipFluidPressureFluidPressure9903/28/069-5 Parker Hannifin CorporationEPS DivisionToll Free: (800) 233-3900www.parkerseals.com